Just Captions

Just Captions adds styled captions to videos and exports captioned video for sharing. It generates captions in more than 50 languages and translates them into more than 33. Users can edit caption text or use AI Correct to fix misheard words. The site lists 15 caption styles, including Emoji, Mega, Word Highlight, and Highlight Box; burn-in captions and brand caption presets are also supported. The browser tool accepts MP4 and MOV files and processes the first 60 seconds locally. Its API returns timed captions in SRT, VTT, or JSON formats. Agent video tools render previews and export MP4 on the user’s computer, and offline recognition keeps media on-device. API recognition uploads extracted audio, while correction, translation, and emoji selection send caption text. The free app offers three videos a day with a watermark and does not require a card. The open-source MCP, CLI, renderer, and style catalog are MIT licensed.

Just Captions offers caption generation, styling, translation, and several export paths. Consider the watermark on free exports, the local-processing limits, and what data is sent when choosing a workflow.

Just Captions suits people who want to caption and style videos, with options for local browser processing, offline recognition, and API workflows. Its free plan is a starting point for users who can work with a watermark.

Overview

Just Captions adds styled captions to videos, with automatic captioning, text editing, translation, and several export options. It suits creators who want to caption videos across a browser, Apple devices, or a custom API workflow. Its free offering is useful, but watermarks, separate API quotas, and distinct data paths for recognition and AI tools call for care when choosing how to work.

Key features

Automatic captions cover 50+ languages, and AI translation covers 33+ languages. Users can edit caption text or use AI Correct to address misheard words. That combination makes the app more than a one-step subtitle generator, though AI correction and translation send caption text to an AI provider.

There are 15 caption styles, including Emoji, Mega, Word Highlight, and Highlight Box. Brand caption presets and burned-in captions support a polished video export, while subtitle export and API responses provide other ways to use the captions. The API returns timed captions in SRT, VTT, or JSON.

The browser tool takes MP4 and MOV files and processes only the first 60 seconds locally in the browser. For longer or repeat work, Pro supports batches of up to 20 videos totaling 60 minutes at once. The MCP integration, CLI, renderer, and style catalog are open source under the MIT license; the maker also offers an API for custom pipelines. Agent video tools render previews and export MP4 on the user's computer.

Data handling varies by workflow: API recognition uploads extracted audio, while correction, translation, and emoji selection send caption text. Offline recognition keeps media on the machine. The privacy policy says optional AI Correct and AI Translate send caption text to OpenAI on the non-China path and DeepSeek on the China path; backup routing may occur when explicitly enabled.

Pricing

The Free plan costs nothing and includes on-device caption generation, single and batch captioning, and three free videos a day. Free exports carry a Just Captions watermark, and no card is needed. That is a practical way to try the core workflow, but the watermark makes it less suitable for finished client or public-facing work.

Pro Monthly and Pro Yearly remove watermarks and add animated caption styles, higher export quality, and 600 AI caption minutes per month. Both have custom pricing. Pro is the better fit for regular publishing that needs clean exports and more polished styling; the monthly AI-minute allowance is worth weighing for heavier caption workloads.

The Free API plan costs nothing, with 30 audio minutes and 50,000 caption characters per month and no card required. API pay as you go has custom pricing: $0.01 per audio minute, billed by the second, and $0.01 per 1,000 caption characters sent. Stripe invoices monthly, the default spend cap is $100/month, and failed requests are not billed. The free API quota suits small experiments; pay as you go is aimed at custom pipelines whose usage may vary.

Platforms

Just Captions is available through API, iOS, macOS, and web. The browser tool's local processing is limited to the first 60 seconds of an MP4 or MOV, while offline recognition keeps media on the device. Those distinctions matter for privacy-sensitive work and longer videos.

Who it's for

Choose Just Captions if you want styled, burned-in captions and editable subtitles, or need to connect captioning to Codex, Claude Code, or a custom pipeline. Its device-based options suit people who prefer to keep media local. Look elsewhere if you need a free, watermark-free export or depend on browser processing for full-length videos.

Pros and cons

Pros

• Free on-device captioning and three videos a day make it possible to use the core app without a card.
• Fifteen styles, brand presets, and burned-in exports give video captions more presentation options than plain subtitles alone.
• Open-source MCP, CLI, renderer, and style catalog support custom workflows, with timed SRT, VTT, and JSON API output.
• Offline recognition keeps media on the machine, an important option for private footage.

Cons

• Free video exports have a watermark, limiting their suitability for finished work.
• The browser tool processes only the first 60 seconds, so longer browser-only jobs need another workflow.
• API recognition uploads extracted audio, and AI correction, translation, and emoji selection send caption text.
• Pro subscription prices are custom, making the cost of removing watermarks and raising export quality harder to assess upfront.

Alternatives

Compare AI video caption generators if you want to consider a wider set of tools.

Captions is worth considering if you want a broader AI video-creation toolkit: its Max plan is $24.99 a month and includes 500 credits, AI Edit styles, AI video creation, and digital twins or custom AI actors. Its listed platforms include Android, API, iOS, and web.

Kaptioned is another freemium captioning option for Android and iOS users.

Blink Captions is an iOS alternative with a free tier capped at three projects, 20 AI points, one seat, and one concurrent task; videos can be up to 20 minutes.

ZapCap is a cross-platform option for Android, API, iOS, and web. Its free plan allows three videos per month, up to 1 minute 30 seconds each, and has no custom templates.

SubFlow AI is an Android and web alternative whose free plan includes 30 processing minutes per month, 15-minute videos, 99+ languages, and SRT and watermarked video exports.

Zeemo is available on web, iOS, and Android; its free plan gives 120 credits per year, limits videos to one minute and files to 200 MB, and caps export quality at 720p.

Alrite supports Android, API, iOS, self-hosted use, and web.

AI Captions is an iOS and macOS alternative with weekly, monthly, and yearly premium plans.

Verdict

Just Captions is a strong fit for creators who want styled captions, local recognition options, and an API or open-source route into custom workflows. Its free tier is a useful starting point, but the watermark and 60-second browser limit narrow what it can do without moving to another workflow. Choose it for its flexible captioning paths; look elsewhere if watermark-free exports at a known price are your priority.